5
remarkably(adverb, little, really, hardly, particularly)
5
second(noun, adjective, lower, spare, inferior)
5
super(person, character, unreasonable, extreme, extravagant)
5
surcharge(noun, fee, supplement, tax, appendage)
5
very(adverb, big)
4
additionally(spare, also, more, too, likewise)
4
additive(noun, increase, addition, ingredient, supplement)
4
backup(noun, adjective, support, lower, copy)
4
benefit(noun, gain, advantage, privilege, plus)
4
contingency
4
else(adjective, adverb, new, different, addition)
4
excessive(adjective, spare, extreme, unwarranted, surplus)
4
furthermore(spare, addition, also, too, likewise)
4
gratuity(noun, advantage, reward, gift, privilege)
4
likewise(adverb, new, spare, addition, additional)
4
moreover(adverb, spare, addition, also, too)
4
notably(adverb, big)
4
noticeably(adverb, particularly, especially, terrifically, unfrequently)
4
optional(adjective, spare, excess, further, surplus)
4
ornament(noun, accompaniment)
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APASmart Define. (2016). extra thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extra/thesaurus/synonyms
ChicagoSmart Define. 2016. "extra thesaurus" https://smartdefine.org/extra/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, extra thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extra/thesaurus/synonyms>.
MLASmart Define. "extra thesaurus" 30 March 2016. Web. 20 September 2026. <https://smartdefine.org/extra/thesaurus/synonyms>